Air-compressor valve.



s. z. mcHoLs. 4 AIR COMPRESSOR VALVE.

APPLICATION FILED FEB. 3, 14918.

1,291,609.l Patented Jan..14,19119 ATTO/2ND@ @FETCH SAMUEL Z. NICHOLS, 0F MILWAUKEE, WISCONSIN.

.AIBfCOMPRESSOR VALVE.

scription, reference beingl had to the 'accompanying drawings, whic specification.

This invention relates to improvements in air compressor valves more particularly are a part of this adapted for use in connection with compressed air apparatus, but is not necessarily limited thereto.

It is one of the objects of the present invention to provide an air compressor valve in the form of a check valve which will open quickly and close slowly and which may be adjusted to close more or less slowly.

A further object of the invention is to provide. an air compressor valve so constructed as to prevent pounding or rattling which is ordinarily caused by the vibration of the valve. i

A further object of the invention is to provide an air compressor' valve having a check valve and a needle valve for controllingthe main valve member of the valve.

A further object of the invention is to provide an air compressor valve which is of simple construction, is strong and durable and is well adapted for the purpose described.

With the above and other objects in view the invention consists of the improved air compressor valveiand its parts and combinations as set forth in the claims and all equivalents thereof. A

In the accompanying drawing in' which the sameV reference characters indicatefthe same parts in all-of the views: i

Figure 1 is a vertical central sectional view of the improved Aair compressor valve;

Fi 2 is a transverse sectional view thereof ta en on line 2-2 of Fig. 1;

Fig. 3 is a vertical sectional detail view taken on line 3 3 of Fig. 1; and

Fig. 4'is a vertical sectional view of la modified form of valve. p

Referrin to the drawing-the numeral 8 indicates t e valve casing of an an lar formA of valve in which 9 lis the recelving fend, 10 the discharge end, 11 the valve chamber and 12 a horizontal partition partly'dividing the inlet opening from the l Specication of Letters Patent.

Patented Jan. 14, 1919.

Application n led February 3, 1916. Serial No. 75,891.

valve chamber. The partition 12 is provided with an upstandin annular valve seat flange 13 which surroun a central opening 14 in the partition and forms a seat for the piston valve 15 positioned in said valve casing. Thevalve V1 6 proper of said piston valve is formed preferably of a softer metal than the valve t0 form an air tight joint with the valve seat when in closed position. The vface of the valve is recessed to form the overlapping and depending annular flange 16 to form a more gradual opening of the valve opening 14 and causing the valve to travel farther before opening thereby displacing more fluid in chamber 19, also flange 16 has the tendency to keep dirt or grit from coming in direct contact with the valve seat.

The piston portion 17 of the valve is of tubular form and reciprocates in the depending cylindrical portion 18 of the valve casing. The cylindrical portion in connection with the piston portion forms an air chamber 19 which is closed at its upper open end by a cap 20 threaded into the valve casing.

It will be noted that the valve seat and the valve are of less diameter than the bore of the cylindrical portion of the casing and in axial alinement therewith so that the cylinder and valve may be drilled and finished at the same time and as the parts are in alinement less work will be required in fitting 4the valve and forming a tight joint.

The bore 21 of the piston is preferably filled with a turned block of wood 22 having a reduced upper end portion 22 to receive the lower convolutions of a coiled spring 23 which is interposed between the filler 22 ,and the casing lcap 20 and which serves to yieldingly hold the piston valve 15 on its seat.

The air chamber 19 is in communication with the valve chamber 11 by means of a checked passageway or vduct 24 and a controlled branch passageway or duct 25. The

passageway 24 extends at right angles into the valve chamber and has an angled supplemental check valve casing 26 threaded into the casingat the lower end of said pas- J sageway and a ball check valve 27 of said The passageway 25 extends parallel to the. .checked passageway 24 and near its upper end is connected to said checked passageway 24 by a cross duct or passageway 28 which extends exteriorly of the casing. A needle valve 29 adjustably threadedin said cross duct 28 seems to control the air flowing Jlieved by the incoming air from the needle valve controlled cross duct.

The needle valve is'provided with a slotted end portion 30 for convenience in adjusting the valveand the outer end of the cross'duct is closed by a cap screw 31 threaded into said cross duct and which is removed when it is desired to adjust the valve.

In use air pressure in the intake side of the valve when in excess of the pressure on the other side of the valve will cause said valve to open and to remain open until the pressure isA substantially equalized due to the retarded closing of the valve.

In the modified form shown in Fig. 4 the valve casing 8 is in the form of a straight way valve and the air piston 17 and the air chamber 19 are positioned beneath the valve 16 proper. The supplemental check valve casing26 and its ball valve 27 extend into the air chamber 19' and a passageway 25 in communication with the supplemental valve 26 and the valve chamber 11 permits air to freely enter said air chamber when the piston valve is moved upwardly to open position. A continuation 28 of this passageway communicates with the air chamber at another point as indicated by the numeral 25 and the entrance of air into the air chamber is controlled by the needle valve 29.

-As the other parts of the modiied form are substantially the same as the first form it is unnecessary to again mention all of the parts.

The operation of the' modified form is similar to the first mentioned form with the exception that when the valve opens airis drawn into the air chamber and in closing From the foregoingdescrintion it will be ,f seen that the air compressorvalve is of very simple construction and is well adapted for the purpose described.

i fWhat 1 claim as my invention is:

1. A valve, comprising a casing having an inlet andan outlet opening and a valve chamber interposed between the two openings, said-casing also having a capped openl ing and an air chamber formed therein, a piston v alve controlling the How between the inlet openingand the valve chamber and extending into and separating the valve chamber from the air chamber, saidpiston valve .being in axial alinement with the capped opening and removablev therethrough,l a check valve in communication with theair chamber and the valve chamber iorretarding the free movement of the piston Valve in one direction, and a valve 1n communication with the air chamber and the valve chamber for controlling lthe movement of thepiston valve toward closed position.

2. A valve, comprising a casing having an inlet and an outlet opening and a Valve chamber interposed between the two openings, said casing also having a capped opening and an air chamber formed therein and passageways between the air chamber and the valve chamber, a piston valve controlling the flow between the inlet opening and the valve Vchamber and extending into the air chamber and lbeing controlled thereby and separating the air chamber from the valve chamber, said piston valve being in axial alinement with the capped opening and removable therethrough, a check valve controlling one of said passageways, and an adjustable valve controlling the other passageway.

3. A valve, comprising a casing having an inlet and an outlet openingv and a valve chamber interposed therebetween, said cas` ing also having a cylindrical portion depending into the valve chamber to form an air chamber thereabove and said casing also Y 'ably extending into the cylindrical portion and separating the air chamber from the valve chamber and having a lower valve portion, said piston valve being in axial alinement with the capped opening and removable therethrough, the lower portion of the valve chamber having a valve seat which is engaged by the valve portion, spring means normally holding the valve in closed position, a check valve in communication with. v

one of the passageways for retarding the free movementof the piston valve toward closed position, and an adjustable valve entering the other passageway for. controlling the movement of the piston valve toward closed position.

4. A valve, comprising a Casin having' an inlet and an outlet opening an a valve chamber interposed'therebetween, said. casin also having a capped opening and a cy indrical portion in axialalinement therewith, and depending into the valve chamber to form an'air chamber -beneath the cap and said casing also having communicating passagewaysbetween the air chamber and the valve chamber, a piston valve slidably extending into the cylindrical portion and separating the air chamber from the valve chamber and having a lower valve portion in axial alinement with the piston portion, the lower inlet portion of the valve chamber having a valve seat of less diameter than the cylindrical portion and also in axial alinement therewith which is engaged by the valve portion, spring means ing the valve in closed position, a check valve mounted within the valve chamber at the outlet end of one of fthe passageways for retarding the free movement of the piston valve toward closed position, and a needle valve entering the other passageway 4for controlling the movement of rthe piston valve toward closed position.

5. A valve, comprising a casing having an inlet and an outlet opening and a valve chamber interposed therebetween, said cas-- ing also having a capped opening and a cylindrical portion in axial alinement therewith and depending into the valve chamber to form an air chamber beneath the cap and said casing also having communicating passageways between the air chamber and the valve chamber, a piston valve slidably extending into the cylindrical portion and separating the air chamber from the valve chamber and having a lower valve portion in axial alinement with the piston portion, said piston valve being removable through the cylindrical portion and the capped opening, the lower inlet portion of the valve chamber having a valve seat which is engaged by the valve portion, spring means normally holding tion, a check valve mounted Within the valve chamber at the outlet end ofone of the passageways for retarding the free movement of the piston valve toward closed position, a threaded opening intersectin the other passageway and extending to t e exterior portion of the valve casing, and a threaded -needle valve entering the threaded opening andthe last mentioned passageway for controlling the movement -of the piston valve toward closed position.

6. A valve, comprising a casing having an inlet and anoutlet opening and a valve chamber interposed therebetween, said casing also having a cylindrical portion depending into the valve chamber to form an air'chamber thereabove and said casing also having a capped opening and communicating passageways between the air chamber and the valve chamber, a piston valve slidably extending into the cylindrical portion normally holdthe valve in closed positop opening,

and separating the air chamberfrom the valve chamber and having a lower valve portion in axial alinement with the piston portion, said piston valve being removable through the capped opening, the lower inlet portion of the valve chamber havinga valve seat which is engaged by the valve portion, means normally holding the valve in closed position, a check valve mounted within the valve chamber at ,the outlet end of oneof the passageways for retardingthe free movement of the 4piston valve toward closed position, a threaded opening intersecting the other passageway and extending to the exterior portion of the valve casing, a' needle valve threaded into the threaded opening and entering the last mentioned passageway for controlling the movement of the piston valve toward closed position, and a cap screw threaded into the threaded opening.

7. A valve, comprising a casing having an inlet and an outlet opening and a valve'cham'- ber interposed therebetween, said casing also having an open top and a cylindrical portion depending into the valve chamber to form an air chamber thereabove and said casing also having vertically extending communicating passageways between the air chamber and the valve chamber and a transverse threaded opening in communication with both passageways and extending to the exterior portion of the casing, the lower end portion of one of the passageways extending toward. the outlet opening of the casing, a cap covering the open top of the casing, a piston valve slidably extending into the cylindrical portion of the casing and separating the air chamber from the valve chamber and having a lower portion in axial alinement with the piston portion and having a depending annular fiange, said piston valve being removable through the capped the lower inlet portion of the valve chamber having an upstanding valve seat which is overlapped and engaged by the valve portion, an angular check valve threaded into the passageway toward the outlet opening of the casing for retarding the free movement of the piston lvalve toward closed position, a needle valve entering the threaded opening and the other passageway for controlling the movement of the piston valve toward closed position, a

cap screw threaded into the threaded opening, and a coiled spring interposed between the piston valve and the casing cap forholding the piston valve in closed which extends 

